Valve mechanism



Dec. 17, 1929. F. c. MARSHALL 1,740,108

VALVE MECHANISM Filed Ap 1927 NVENTO A T0RNEy Patented Dec. 17, 1929UNITED STATES PATENT OFFICE winners 0. MARsnALn, or measly, Wisconsin,assieivo'n To "0. A. 'Liiwron 00., or DE PERE, WISCONSIN mm;ivrEcHANIsin Application filed April 4, 1927. Serial no. water Theinvention relatesto air compressors, and more particularly to valvemechanism therefor. v e V V v V a It is the desideratum in theconstruction and operation of. air compressors to employ valves for thecontrol of air throughthe ports of the compressor which will operatequickly, reliably and as noiselesjsly as possible, and which will permitof the passage of as large volumes of'air as possible; and particularlyto provide a valve construction for compressors operative without theuseof springs to close the valves and which are not in any wise securedor connected to their seats but are loosely contained so that they inayoperate without restraint.

The primary object of the invention is the provision of valve mechanismfor compressors or other apparatuses, wherein the valves are of lightweight and loosely contained, whereby the machine may be efficiently andsucessfully operated at high speed, without liability of overheating ofthe said machine. I k

Another object of the invention isthe pro vision of valve mechanism ofthe character stated, wherein the same is freely accessible,

and possesses maximum port area, and a minimum amount of movement, thusproducing a' valve which will be durable, noiseless and relativelyinexpensive to manufacture and in initial installation cost and foroperating.

A further object of the invention is the provision bf valve mechanism ofthis character, which is comparatively simple in construction,thoroughly reliable and efficient in its purposes, strong, durable, andwhich may be readily examined and removed from the machine.

anodifications may be resorted to as come properly within the scope ofthe annexed claims, without departing from the spiritof the invention orsacrificing any of its advang In the accompanying drawings y Figure l,is a vertical central sectionalview through a portion of an aircompressor, showing the valve mechanism constructed in accordance withthe invention, a y

Figure. 2, is a planview of the upper end or headof the compressor,showing bydctted lines theports andpassages for theinletand outlet fluidto and from the said compressor.

Figure 3, is a view similarto Figure 1,taken at substantially rightangles thereto with the valves in altered positions. U

Similar referencecharacters indicate corresponding parts throughout theseveral views in the drawings. H c

To accomplish the purposes of this invention, there has been shown inthe accompanymg drawings, in its present embodiment, a suitable aircompressor cylinder A, within which is a reciprocating piston B, andupon the upper end of the cylinderA, i s secured a suitable cylinder head 10, pref erably in the form of a disk, retained in suspended relationto the cylinder A, by a centering stem 11, passed centrally throughanouter dome or closure head 12, for said cylinder, the head stem 11,being extended through the latter andhas engaged thereon a crownnut 13,which is tapped thereon and is seated against a central boss 13; formed,on the dome or head 12. The dome or head 12, is constructed to be airorwater cooled in any desirable manner, and is removably' fastened inposition on the upper end of thecylinder A, through the medium of aseries of bolts 14, marginally engaged therein. 7

Formed in the wall of the cylinder A, at diametrically opposite pointsthereof are inlet and outlet ports 15 and 16, respectively, the'port 15,being provided with an upwardly directed passage 17 and likewise theport 16, has an upwardly directed pa'ssage'lS, and these passages openintoways 19, and, 20, respectively, formed in'the dome or head 12, whichlatter being also formed with, inlet and exhaust chambers, or recesses21 and 22, respectively. The chambers or recesses 21 and controlled inthe opening and closing ofthe same, through the medium of a flatrelatively thin ring-like valve 29, floatingly held be tween the head10, and the "seatso,-counter sunk in the face adjacent thereto of thedome or head 12. I v

The head 10, has formed therein a series of spaced outlet openings 31,concentrically thereof, whichlatter communicate with the chamber orrecess 22, in the dome or head 12. Surrounding the stem 11, is aretainer sleeve 32, which rests upon a central boss 33, on the head 10,and is formed with a flared enlarged lower end 34, spaced from andconfronting a flat relatively thin ring-likevalve 35, concentrically ofthe boss 33, andadapted to engage a seat 36, on the head 10, under theaction of a coiled spring 3?, of the expansion type, to close theopenings 31, the spring 37, being about the hoss 33, and conlined by thefiared'end 34, of the sleeve 32. This sleeve 32, has between it and thedome or head 12, a lock washer 38, surrounding the stem 11, and activethereon to compress a gasket 39, between the boss 13, and the crown nut13, so as to renderthe dome 'or head 12,leak-proof around'the stem11,passed therethrough. I

By thus forming and arranging the parts as hereinbefore described, thereis provided a free portage for the air and the valves have but littlelift and are practically noiseless in operation. The structure is alsoadapted to be operated at high speeds without impairing the efliciencyof the compressor, which not infrequently occurs in air-compressors ofthis character owing to the valves fluttering or failing to closeproperly at high speeds.

Arranged in suitable manner and in a pocket formed in the inner head 10,at the required points, is a coiled expansible lifting spring 40, whichis adapted to work against the ring-like valve 29, for the positiveclosing of the inlet openings28, opening through the seat 30, for saidvalve.

- The lock washer 38, surrounding the stem 11, serves to holdtheretainer sleeve 32, down against boss 33, and thecompressionof thegasket 39, is accomplished by the fact that the head 10, is drawn uptight against seat 41 for the dividingwalls 24, inthe dome or head 12,soas to prevent 'air leakage, as will be obvious. I I p It w ll beapparent that the dome or head 12, is reversible on the cylinder A, soas to enable the changing the inlet and exhaust from either side of thecompressor, at the election of the user thereof.

There has been no attempt to illustrate or describe certainmodifications in structural details which may be contemplated, and whichmight be desirable under certain conditions, as it is believed thedisclosure made herein will enable those skilledin the art towhich theinvention pertains to embody or adoptthe same as circumstances maydictate.

What isclaimed is:

1. In a structure of the character described, the"combinationwith acylinder, of a fluid cooled dome on the cylinder and havingconcentrically disposedinl'et and exhaust chambers, a disk like headconfronting the bore of the cylinder andhaving a center stem removablyinserted centrally through the dome, means engaging the stem outside ofthe dome to fasten the head therewith, said head being constructed toform a continuous peripheral inlet from the inlet chamber to thecylinder, said head further being formed with ex haust portscommunicating with the exhaust chamber, ring like valves interceptingthe in let and exhaust ways, and means normally holding the valves inclosed positions. 7

2. In a structure of the character described, the combinationwith acylinder, of a fluid cooled dome on the cylinder and having con.-'centrically disposed inlet and exhaust chambers, a disk like headconfronting the bore of the cylinder and having a center stem removablyinserted centrally. through the dome, means engaging the stem outside ofthe dome to fasten the head therewith, said head being constructed andarranged to effect a continuous peripheral inlet from the inlet chamberto the cylinder, said head further being formed with exhaust. portscommunicating with the exhaust chamber, 'ring-like valves interceptingthe inlet and exhaust chambers,

means normally holding the valves in closed positions, and a retainingsleeve onthe stem and overhanging the valve for the exhaust way.

In testimony whereof I affix my signature.

FRANCIS C. MARSHALL.

